After achieving complete remission, patients receive MARAM chemotherapy comprising oral mercaptopurine daily on days 1-14; methotrexate IV over 24 hours on days 1 and 8; leucovorin calcium orally or IV 36, 42, and 48 hours after beginning each dose of oral methotrexate; methotrexate IT on days 2 and 9; cytarabine IV over 3 hours twice daily on days 15, 16, 22, and 23; and asparaginase IV over 1 hour or IM on days 16 and 23. Patients receive prednisolone IT in combination with any dose of intrathecal methotrexate.